Delhi temperature: capital records coldest October day in four years as Cyclone Arnab brings rain

Delhi’s temperature fell to its lowest reading for October in four years as rain associated with Cyclone Arnab swept across the capital, with the minimum temperature recorded at 15.7°C and light rainfall reported through the day. The India Meteorological Department (IMD) also placed parts of Delhi under a red alert for rain, and the city’s air quality remained in the ‘poor’ category.

This article summarises what is known about the current Delhi temperature picture, what caused the unseasonable cold, and how the weather system collided with one of India’s most widely observed festival evenings. Where reports leave questions open, those gaps are flagged rather than filled with guesswork.

Current Delhi temperature: what has been recorded?

The minimum temperature in Delhi was recorded at 15.7°C, according to news reports covering the event. This reading came on the city’s coldest October day in four years, as rain and cloud cover helped push the mercury down across the capital. Light rainfall was observed through the day, and the combination of wet ground, persistent cloud and strong winds kept temperatures suppressed well below the recent October norm.

At a glance: Delhi weather snapshot

The confluence matters because October in Delhi still carries traces of the departing monsoon, and a minimum this far below the seasonal pattern is the kind of reading weather agencies track closely. Early cold spells can strain heating demand, affect tender crops in the surrounding agricultural belt, and tighten the atmosphere just as the city’s annual pollution season begins to build.

Why did Delhi’s temperature drop this October?

The sharp drop in the Delhi temperature has been attributed to the rain impact of Cyclone Arnab, a cyclonic system whose moisture moved over North India. When moisture-laden winds from a cyclone travel inland, they typically produce cloud cover, rainfall and cooler daytime temperatures — all of which were observed in Delhi.

Moisture from a tropical system acts as an insulating ceiling: clouds trap and disperse sunshine that would otherwise warm the surface, and evaporating rain draws heat from the air. Add gusty winds to the mix and the felt chill rises even where the thermometer may stabilise. That combination of rain, cloud and wind is precisely what the reports describe for the capital.

What is Cyclone Arnab?

Cyclone Arnab is a cyclonic storm whose circulation brought moisture and atmospheric instability over the Delhi region. Cyclones forming near the Indian subcontinent often channel moisture far inland, and the cloudiness and rainfall they produce can push temperatures well below the seasonal norm. The reports do not detail the system’s path or landfall beyond its effect on Delhi, but its role in the city’s cold October day is clearly established by the headlines.

What impact did the weather have on Karwa Chauth?

The unseasonal rain coincided with Karwa Chauth, the festival on which married women fast from sunrise until the evening moon is sighted. Cloud-covered skies were flagged as a possible delay to that moon sighting, with rain, thunderstorms and gusty winds reported across Delhi and the National Capital Region while the IMD’s red alert remained in force over parts of the city.

How does cloud cover affect moon sightings?

On Karwa Chauth, tradition asks that the fast be broken only after the moon — or its reflection — is sighted in the evening sky. Overcast conditions do not abolish the moon, but they can physically block the view, push the sighting later into the night, or create confusion about whether the moon has appeared. Where brief cloud breaks occur, devotees commonly look for the moon’s reflection in a vessel of water, a widely used workaround on cloudy festival evenings in India.

What is Delhi’s air quality right now?

Alongside the temperature drop, Delhi’s air quality remained in the ‘poor’ category, as reported by multiple outlets. October usually marks the start of the capital’s annual air-quality decline, when falling temperatures, weaker winds and stubble burning in neighbouring states begin trapping pollutants over the city. The reports do not confirm whether the light rain on this particular day improved conditions or merely held the rating steady, although wet weather generally helps settle particulate matter for a period.

Is a 15.7°C minimum unusual for Delhi in October?

Yes, by the standards of recent years. News outlets described the reading as the city’s coldest October day in four years. Delhi does naturally begin cooling in October as the monsoon recedes and the winter transition begins, so the month is not cold by definition — but this year’s system pushed temperatures further than anything the city had seen in the intervening four years.

Three factors converged to produce the four-year low: moisture from Cyclone Arnab, persistent rain-bearing cloud, and the pre-winter seasonal shift. Because the reports give no indication of whether temperatures will fall further or whether the red alert will be extended, residents should consult the IMD’s latest bulletins before planning activities that depend on dry weather.

What should Delhi residents keep in mind this week?

• Track IMD red alert bulletins for the latest rain and thunderstorm warnings affecting your district.
• Expect continued cloudiness and gusty winds, especially through the evening hours.
• Keep warm clothing handy, as nights are colder than Delhi’s recent October norm.
• Anyone sensitive to air pollution should monitor live AQI updates while the city is rated ‘poor’.
• If observing Karwa Chauth, check sky conditions before the evening moon-sighting window.

Frequently Asked Questions

Why did Delhi record its coldest October day in four years?

Rain and cloud cover linked to Cyclone Arnab pushed temperatures down across the capital, with a minimum of 15.7°C recorded. Light rain, thunderstorms and gusty winds accompanied the system, keeping the mercury well below the recent October norm. The India Meteorological Department issued a red alert for rain over parts of the city.

What was the minimum temperature recorded in Delhi?

The minimum temperature was 15.7°C, according to the reports. The reading came on the city's coldest October day in four years, and was accompanied by light rainfall and overcast skies that persisted through the day across Delhi and neighbouring areas of the National Capital Region.

Could the cloudy weather delay Karwa Chauth moon sighting?

Yes. Rain, thunderstorms and cloudy skies across Delhi-NCR threatened to obscure the evening moon that formally ends Karwa Chauth, when married women who have fasted all day sight the moon before breaking their fast. News reports specifically flagged the possibility that the moon sighting could be delayed under the overcast conditions.

What is Delhi's air quality status during the cold spell?

Air quality in Delhi remained in the 'poor' category while the cold weather persisted. October marks the beginning of the capital's seasonal air-quality decline, and the reports noted the rating without indicating any improvement from the light rain. Sensitive groups are typically advised to limit prolonged outdoor activity at this level.

What does an IMD red alert mean in this context?

The India Meteorological Department placed parts of Delhi under a red alert for rain as Cyclone Arnab's system affected the region. Red alerts are the most serious level in the IMD's colour-coded warning scale, signalling severe weather that is either occurring or highly likely, and residents are advised to take precautions and monitor updates.